I love this thread! Great idea!!!!!!!
I have a ton. All I read about are dogs!!
Dog Body, Dog Mind. 
Amazon.com: Dog Body, Dog Mind: Exploring Canine...
That is my top recommendation. It explores the consciousness of dogs. The book goes into the amazing ways in which dogs are MORE conscious and aware then humans, discusses how they experience death and mourning, how they experience love, ect.
It is written by a scientist, but its extremely readable and well written. If anyone ever says to you, "But its just a dog!" - and you are at a loss for words as to how to explain that, no, our dogs are not "JUST" anything!! This book is over a 100 pages of backup on why dogs are not "JUST" dogs, they are conscious beings, deserving of love and care and they ARE aware of the love they receive.
I can't say enough how much comfort, laughter and understanding this book brought to me. It taught me tons about how to effectively communicate and understand my dogs. ITS AN AWESOME book.
I also loved
For the Love of Dogs Amazon.com: For the Love of a Dog: Understanding...
Same principle as above, but more detailed on experiencing emotions and the writer's experiences with dogs from the perspective of a behaviorist, rather then a scientist...
How Dogs Think by Stanley Coren is a good one, too!
Amazon.com: How Dogs Think: What the World Looks...
If you are interested in nutrition, the pet food industry and last years pet food recalls, then Dog Food Politics is a great book. It gets down deep into the pet food industry's corruption and how the pet food recall which killed and injured so many pets happened and how it could easily happen again.
Amazon.com: Pet Food Politics: The Chihuahua in...